Eryk Sun <[email protected]> added the comment:
I closed bpo-20010 because the official PSF distributions of Python 3.5+ for
Windows use the Universal CRT (ucrt), the system C runtime library for
applications. ucrt does not have this problem with the "%z" format code. For
example, using ctypes:
>>> import ctypes
>>> timeptr = (ctypes.c_int * 9)()
>>> dest = (ctypes.c_char * 100)()
>>> ucrt = ctypes.CDLL('ucrtbase', use_errno=True)
>>> ucrt.strftime(dest, 100, b"%z", timeptr)
5
>>> dest.value
b'+0100'
Mingw-w64 probably links against msvcrt.dll, the private CRT that's used by
some system components. For example:
>>> msvcrt = ctypes.CDLL('msvcrt', use_errno=True)
>>> msvcrt.strftime(dest, 100, b"%z", timeptr)
22
>>> dest.value
b'Mitteleurop\xe4ische Zeit'
This a third-party problem since Python is simply calling C strftime(). I'll
leave this open for a core developer to consider, but I don't think a
workaround is likely at this level. IIRC, compiling Python with Mingw-w64
requires extensive patching, so a workaround is more likely to be applied at
that level.
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<https://bugs.python.org/issue43649>
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